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I have had a vacuum gauge installed for years and 95% of the time the reading is below 10 inches of water. The indicator on the dash, by the steering wheel moves into the red area at about 20 inches of water. Perhaps those numbers could be useful when comparing a different air filter.

I have a problem with the last comment...mine idles with a slight haze and runs virtually smokeless on the highway. The multifuel hypercycle is an uncommonly efficient combustion process and quiet to boot. (Looking for something else and ran into this old post)